Sonoff Mini R2 - external switch state

[P372]

Hi!
I'm using Sonoff Mini R2, flashed with Tasmota with Domoticz - without any problems.
The only think I'll be very happy to have is data about the external switch (connected to S1/S2) state.
I've tried to sniff it using the Domoticz page on Tasmota panel, but without any success.

Each state change on this switch is visible on Tasmota console as:
11:16:04 MQT: tasmota/lamps/stat/SWITCH1T = {"TRIG":"ON"}

[waltervl]

How do you connect your Tasmota with Domoticz?
Using a plugin? Which on?